Improvement in chimney-tops



'UNITED STATES PATENT OFFICE.

CHARLES W. MUNGER, OF PER, ILLINOIS.

IMPROVEMENT IN CHIMNEV-TOPS.

y `Specification forming part of Letters Patent No. 159,344, dated February 2, 1875; application filed July 21, 1874.

To all whom t may concern Beit known that I, CHARLES W. MUNGER, of Peru, in the county of La Salle and State of Illinois, have invented a certain Improvement in Chimney-Tops, of which the following is a specication:`

The nature of my invention consists in cornbining with a chimney-top, so constructed as to protect the upper end ofthe chimney on all sides against damage from the weather and the heat, means for increasing the draft, so fully explained in the ensuing description, and so specically pointed out in the claims, as to require no detailed preliminary statement.

ln the annexed drawings, Figure 1 is a sectional elevation of my improved chimney-top. Fig. 2 is also a sectional elevation, taken in a plane atright angles to the plane of the section illustrated in Fig. l. Fig. 3 is a plan view, the fan-Wheel being omitted.

The same letters of reference are used in all the figures in the designation of identical parts.

The cap proper, intended to lit snugly over the top of the chimney, consists of the horizontal plate A and the vertical plates A1 and A2; the chimney it is designed to cover lilling the space between the plates A1 and A2 up to the horizontal flanges or corner-pieces A3, which support the entire structure resting on the top of the chimney. The form of the cap must, of course, conform to that of the chimney. The material employed may be cast-iron, sheet-iron, or fany other suitable kind of metal. The exterior plate or wall A1- ofthe cap, above the supporting corner pieces A3, is provided with a series of holes, a', behind an overhanging hood, A4, extending' e11- tirely around the cap. Air ascending under this hood, and through the holes c into the air-space of the cap above the top of the chimney, escapes upward through the holes a in the top plate, A, and ascends through the space between the pipes B and C, the expanded bases of which are, respectively, supported on the chimney-cap, in the manner shown clearly in Figs. l and 2, the exterior pipe B being litted over the exterior cap, and the interior pipe G over the upwardly-projecting end of the interior wall thereof. The pipe G extends up to the base of the enlarged top B of the pipe B, and is on its upper end provided with a horizontal flange, c, snugly tting the pipe B. The air ascending through the space lbetween the pipes, being thus checked at this point, is caused to pass into the vertical lues C', formed in the pipe C, and escapes in jets from these lues, of which I have shown four, as seen in Fig. 3,.into the top of pipe B, and, tending to create a partial vacuum in the pipe O, aids in creating a strong upward draft therein, and in the chimney which it covers, or is placed upon. The heat radiated through the pipe C will rarefy the air between it and the exterior pipe to such an extent as to cause a strong upward current between them of cooler air entering through the holes a. As still another means for promoting the draft, I propose to employ a ventilator or fan-wheel, D, turning on a horizontal axis in a frame, E, supported by a vertical stem, F, in bearings formed in cross-bars f and f in the pipe C. The frame E carries the usual vane G, vwhich keeps the fan-wheel in proper position for the action of the wind upon it. The fan is partly exposed above the top of pipe B, so that the passing wind will turn it in the direction indicated by the arrow in Fig. l. v It acts as a suction-fan, and to prevent the downward motion ot its blades from throwing any air down into pipe C, I provide the frame E with a shield, H, underneath the fan, and overhanging the top of pipe C on the descending side of the blades of the fan. In lieu of the fan-wheel shown an ordinary globe ventilator may be used.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. 'Ihe chimney-cap, constructed to protect the top of a chimney on all sides, and having the overhanging hood A4 and holes a and a', in combination with the pipe B and pipe O, with flange c, and having lines C', substantially as specified.

2. The pipes B and C, with air-tlues between them, in combination with the revolving suction-ventilator D and shield H, substantially as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

cEARLEs w. MUNGER.

Witnesses:

H. W. UNDERHILL, J onN C. WALKER. 

